Create app.py

app.py

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+import gradio as gr
+from langchain.vectorstores import Chroma
+from langchain import HuggingFaceHub
+from langchain.embeddings import HuggingFaceEmbeddings
+from langchain.text_splitter import CharacterTextSplitter
+from langchain.document_loaders import TextLoader
+from langchain.chains import RetrievalQA
+import os
+os.environ['HUGGINGFACEHUB_API_TOKEN'] = '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'
+llm = HuggingFaceHub(repo_id="google/flan-t5-xxl")